US4668242A - Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby - Google Patents

Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby Download PDF

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Publication number
US4668242A
US4668242A US06/702,624 US70262485A US4668242A US 4668242 A US4668242 A US 4668242A US 70262485 A US70262485 A US 70262485A US 4668242 A US4668242 A US 4668242A
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United States
Prior art keywords
mesh
potassium
granulate
sulphate
particle size
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Expired - Fee Related
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US06/702,624
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English (en)
Inventor
Antonio Vitellaro
Giovanni Sanfilippo
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Italkali Italiana Sali Alcalini SpA Soc
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Italkali Italiana Sali Alcalini SpA Soc
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Assigned to ITALKALI SOCIETA ITALIANA SALI ALCALINI S.P.A. reassignment ITALKALI SOCIETA ITALIANA SALI ALCALINI S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SANFILIPPO, GIOVANNI, VITELLARO, ANTONIO
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
    • C01D5/004—Preparation in the form of granules, pieces or other shaped products

Definitions

  • This invention relates to a process for preparing granulated potassium sulphate and potassium magnesium sulphates.
  • the tendency of farmers to favor fertilizer mixtures which are able to satisfy all the different soil and crop requirements by employing suitable products requires the increasingly widespread availability of individual nutrient components (based on potassium, nitrogen and phosphorus) in the form of granules which are approximately similar to each other in terms of dimensions and visual characteristics, so that the composite fertilizer obtained by mixing does not lack homogeneousness.
  • No natural process is currently known for preparing simple granular potassium-based compounds. Products are, however, known in which the salt is formulated together with binders, which have the drawback of lowering the concentration in the granulate, besides obviously increasing production costs.
  • the object of the present invention is to provide a process which in a simple and economical manner produces a potassium granulate as such, free from additives, which has the required hardness and compression and abrasion resistance characteristics.
  • step (b) mixing the ground product of step (a) with a corresponding unground sulphate until a predetermined particle size distribution curve is obtained.
  • step (c) treating the mixture of step (b) with a hot, saturated solution of a corresponding sulphate until a wet paste is obtained, and the final further steps of granulating said paste and drying the granulate thus obtained.
  • each block represents one stage of the system employed to perform the process.
  • the process comprises in general the following operational stages in combination and succession:
  • the potassium sulphate originating from storage 1 is divided into two streams of which one goes to the processing stage 2 and the other, together with material originating from the processing stage 7, goes to the processing stage 3 where it is ground in a ball mill and reduced to a very fine powder.
  • the product originating from the processing stage 5 is dried in a fluidized bed drier 6 and is then riddled in a vibrating screen 7 in order to obtain: a product with a particle size distribution of between 2 and 5 mm, which represents the finished product; a fraction with a particle size of less than 2 mm which is recycled partly to the processing stage 8 and serves for preparing the saturated potassium sulphate solution, and partly to the processing stage 3; and a fraction with a particle size of greater than 5 mm which is fed to a crusher 9 and then, after being reduced to a particle size distribution mainly of between 2 and 5 mm, to the fluidized bed drier 6 where it is further dried.
  • 6 t/h go to the processing stage 2 and 4 t/h, together with 2 t/h of material originating from the processing stage 7, go to the processing stage 3 from which 6 t/h of a product are obtained having the following average particle size distribution:
  • the wet paste which has been well mixed in the processing stage 2, passes to the processing stages 4 and 5 and then to 6, from which 13.9 t/h of dry material are obtained.
  • the dry material originating from the processing stage 6 passes to the processing stage 7, from which 10 t/h of product with a particle size distribution of between 2 and 5 mm, 2.2 t/h of a fraction with a particle size of less than 2 mm, and 1.7 t/h of a fraction with a particle size of greater than 5 mm are obtained.
  • 0.2 t/h pass to the processing stage 8 and 2 t/h to the processing stage 3.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Fertilizers (AREA)
  • Glanulating (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US06/702,624 1984-06-19 1985-02-19 Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby Expired - Fee Related US4668242A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21488/84A IT1174208B (it) 1984-06-19 1984-06-19 Procentimento per la produzione di solfato potassico e di solfati potassico magnesiaci granulati, e granulati cosi'prodotti
IT21488A/84 1984-06-19

Publications (1)

Publication Number Publication Date
US4668242A true US4668242A (en) 1987-05-26

Family

ID=11182557

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/702,624 Expired - Fee Related US4668242A (en) 1984-06-19 1985-02-19 Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby

Country Status (12)

Country Link
US (1) US4668242A (enrdf_load_stackoverflow)
JP (1) JPS6114123A (enrdf_load_stackoverflow)
AU (1) AU576823B2 (enrdf_load_stackoverflow)
BE (1) BE901871A (enrdf_load_stackoverflow)
CA (1) CA1247328A (enrdf_load_stackoverflow)
DD (1) DD237502A5 (enrdf_load_stackoverflow)
DE (1) DE3506162A1 (enrdf_load_stackoverflow)
ES (1) ES541005A0 (enrdf_load_stackoverflow)
FR (1) FR2565960B1 (enrdf_load_stackoverflow)
IT (1) IT1174208B (enrdf_load_stackoverflow)
SU (1) SU1443795A3 (enrdf_load_stackoverflow)
UA (1) UA6033A1 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6106796A (en) * 1998-10-13 2000-08-22 Airborne Technologies Inc. Method of ammonium sulfate purification
US6132484A (en) * 1998-04-17 2000-10-17 Airborne Industrial Minerals Inc. Wet granulation method for generating fertilizer granules
US6293985B1 (en) 1998-04-17 2001-09-25 Airborne Industrial Minerals Fertilizer granulation method
US6299663B1 (en) 1996-04-19 2001-10-09 Airborne Industrial Minerals Inc. Granulation method and apparatus therefor
US6331193B1 (en) 1998-04-17 2001-12-18 Airborne Industrial Minerals Inc. Wet granulation method generating sulfur granules
US6334990B1 (en) 1999-10-21 2002-01-01 Airborne Industrial Minerals Inc. Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine
US6375824B1 (en) 2001-01-16 2002-04-23 Airborne Industrial Minerals Inc. Process for producing potassium hydroxide and potassium sulfate from sodium sulfate
US6454979B1 (en) 1998-04-17 2002-09-24 Airborne Industrial Minerals Inc. Wet granulation method for generating granules
US6582637B1 (en) 1999-05-05 2003-06-24 Agronomic Growth Industries Ltd. Compost granulation method
US6692716B1 (en) 1998-10-13 2004-02-17 Airborne Industrial Minerals, Inc. Method of formulating alkali earth salts
US20070280981A1 (en) * 2006-06-02 2007-12-06 The Andersons, Inc. Adherent biologically active ingredient carrier granule
CN100542957C (zh) * 2007-10-18 2009-09-23 南风化工集团股份有限公司 一种无水硫酸钠的造粒方法
CN107365180A (zh) * 2017-05-25 2017-11-21 滕国清 制造硫酸钾镁颗粒的生产方法及硫酸钾镁颗粒的用途

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5017398A (en) * 1987-04-10 1991-05-21 The Procter & Gamble Company Improved margarine compositions/containing solid sucrose polyesters
US4797300A (en) * 1987-04-10 1989-01-10 The Procter & Gamble Company Compositions containing novel solid, nondigestible, fat-like compounds
US6077556A (en) * 1989-04-10 2000-06-20 The Procter & Gamble Company Solid, nondigestible, fat-like compounds
JP4566620B2 (ja) * 2004-05-14 2010-10-20 花王株式会社 造粒物

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979421A (en) * 1958-01-27 1961-04-11 Fluor Corp Urea granulation process
US3231413A (en) * 1960-09-28 1966-01-25 Potasse & Engrais Chimiques Method and apparatus for granulating melted solid and hardenable fluid products
US3501282A (en) * 1966-09-09 1970-03-17 Shell Oil Co Preparation of pelletized potassium chloride-ur a-sulfur fertilizer
US3853490A (en) * 1973-01-22 1974-12-10 Int Minerals & Chem Corp Granulation of potassium sulfate
US3923489A (en) * 1973-05-23 1975-12-02 Ralph W Richardson Pelletized fertilizer
US3979198A (en) * 1973-10-29 1976-09-07 Agritec, Co. Polyurethane plant growth medium
US4081266A (en) * 1975-12-22 1978-03-28 Agrico Chemical Company Stable fluid suspension fertilizer composition and method for producing same
US4183738A (en) * 1977-05-09 1980-01-15 International Fertilizer Development Center Granulation process and products produced thereby
US4277253A (en) * 1978-12-22 1981-07-07 Adelaide & Wallaroo Fertilizers Ltd. Granulating an aqueous dispersion of ammonium and potassium salts

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440033A (en) * 1964-06-25 1969-04-22 Int Minerals & Chem Corp Method for producing granular product
US3620709A (en) * 1969-04-29 1971-11-16 Int Minerals & Chem Corp Granulation of potassium sulphate
DE2106212B2 (de) * 1971-02-10 1972-05-25 Kali Und Salz Ag, 3500 Kassel Verfahren zur herstellung von granulaten aus feinteiligen kaliumsulfat-magnesiumsulfat-hydraten
AU486139B2 (en) * 1975-11-17 1976-01-15 Thomas, G. Production of magnesium ammonium phosphate
CA1106154A (en) * 1976-12-02 1981-08-04 William B. Dancy Granulation of potash salts
US4385920A (en) * 1976-12-02 1983-05-31 International Minerals & Chemical Corp. Granulation of potash salts

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979421A (en) * 1958-01-27 1961-04-11 Fluor Corp Urea granulation process
US3231413A (en) * 1960-09-28 1966-01-25 Potasse & Engrais Chimiques Method and apparatus for granulating melted solid and hardenable fluid products
US3501282A (en) * 1966-09-09 1970-03-17 Shell Oil Co Preparation of pelletized potassium chloride-ur a-sulfur fertilizer
US3853490A (en) * 1973-01-22 1974-12-10 Int Minerals & Chem Corp Granulation of potassium sulfate
US3923489A (en) * 1973-05-23 1975-12-02 Ralph W Richardson Pelletized fertilizer
US3979198A (en) * 1973-10-29 1976-09-07 Agritec, Co. Polyurethane plant growth medium
US4081266A (en) * 1975-12-22 1978-03-28 Agrico Chemical Company Stable fluid suspension fertilizer composition and method for producing same
US4183738A (en) * 1977-05-09 1980-01-15 International Fertilizer Development Center Granulation process and products produced thereby
US4277253A (en) * 1978-12-22 1981-07-07 Adelaide & Wallaroo Fertilizers Ltd. Granulating an aqueous dispersion of ammonium and potassium salts

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6299663B1 (en) 1996-04-19 2001-10-09 Airborne Industrial Minerals Inc. Granulation method and apparatus therefor
US6454979B1 (en) 1998-04-17 2002-09-24 Airborne Industrial Minerals Inc. Wet granulation method for generating granules
US6132484A (en) * 1998-04-17 2000-10-17 Airborne Industrial Minerals Inc. Wet granulation method for generating fertilizer granules
US6293985B1 (en) 1998-04-17 2001-09-25 Airborne Industrial Minerals Fertilizer granulation method
US6331193B1 (en) 1998-04-17 2001-12-18 Airborne Industrial Minerals Inc. Wet granulation method generating sulfur granules
US6692716B1 (en) 1998-10-13 2004-02-17 Airborne Industrial Minerals, Inc. Method of formulating alkali earth salts
US6106796A (en) * 1998-10-13 2000-08-22 Airborne Technologies Inc. Method of ammonium sulfate purification
US6582637B1 (en) 1999-05-05 2003-06-24 Agronomic Growth Industries Ltd. Compost granulation method
US6334990B1 (en) 1999-10-21 2002-01-01 Airborne Industrial Minerals Inc. Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine
US6375824B1 (en) 2001-01-16 2002-04-23 Airborne Industrial Minerals Inc. Process for producing potassium hydroxide and potassium sulfate from sodium sulfate
US20070280981A1 (en) * 2006-06-02 2007-12-06 The Andersons, Inc. Adherent biologically active ingredient carrier granule
CN100542957C (zh) * 2007-10-18 2009-09-23 南风化工集团股份有限公司 一种无水硫酸钠的造粒方法
CN107365180A (zh) * 2017-05-25 2017-11-21 滕国清 制造硫酸钾镁颗粒的生产方法及硫酸钾镁颗粒的用途

Also Published As

Publication number Publication date
BE901871A (fr) 1985-07-01
CA1247328A (en) 1988-12-28
AU3910485A (en) 1986-01-02
DD237502A5 (de) 1986-07-16
AU576823B2 (en) 1988-09-08
SU1443795A3 (ru) 1988-12-07
JPS6114123A (ja) 1986-01-22
DE3506162A1 (de) 1985-12-19
IT8421488A0 (it) 1984-06-19
JPH0240001B2 (enrdf_load_stackoverflow) 1990-09-10
UA6033A1 (uk) 1994-12-29
FR2565960B1 (fr) 1987-02-27
IT1174208B (it) 1987-07-01
DE3506162C2 (enrdf_load_stackoverflow) 1989-08-24
FR2565960A1 (fr) 1985-12-20
ES8603161A1 (es) 1985-12-01
ES541005A0 (es) 1985-12-01

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